Works like all the masstorage devices with the A1. Rebooting usually requiered allthough. The Olympus C-370 camera worked fine too before. I had a Samsung too but it didn't communicate with the A1.
Although the iPod can be used as a large USB hard drive, there is now OS4 support available with a Perl package called "apod," available on OS4Depot. There is excellent Linux compatibility with the program GTKPod